Add 'variants' to non_configuration_keys. Review URL: http://codereview.chromium.org/60080
Add 'variants' to non_configuration_keys.
Review URL: http://codereview.chromium.org/60080
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google